The Supplyhut 100 10×13 Poly Mailers Envelopes are sturdy and reliable shipping bags designed for small to medium-sized businesses. These self-seal envelopes are made of 2 mil thick plastic, providing durability for protecting and shipping items. The exterior size of 13 inches x 10 inches allows for a variety of items to be safely packaged and shipped with ease. Whether sending documents, products, or packages, these poly mailers offer a convenient and efficient solution for your shipping needs.